Casting mold



Ap 1931- J. s. THOMPSON ,060

CASTING MOLD Filed July 16, 1929 2 Sheets-Sheet l April 14, 1931. J. s. THOMPSON CASTING MOLD Filed July 16, 1929 2 Sheets-Sheet 2 Patented Apr. 14, 1931 UNITED STATES rarsn'r orrics JAMES S. THOMPSON, OF NEW YORK, N". Y., ASSIGNOR TO THE AMERICAN BRAKE SHOE AND FOUNDRY CQMPANY, OF WILMINGTQN, DELAWARE, A CORPORATION OF DELA- 'WARE CASTING lvronn Application filed July 16,

This invention relates to casting molds and while it is especially useful in molding railway brake shoes it is not limited thereto but may be used in different forms for making many different kinds of castings.

The invention has for its object, generally, to simplify and improve the means for casting permanent molds whereby theoperation is greatly simplified and facilitated 19 and enabled to be carried on with a greater degree of efficiency and at a lower maintenance and operating cost than has been possible heretofore.

More specifically the invention has for its object to provide a permanent mold of relatively light weight and simplicity of construction; to reduce the labor of operating permanent molds; to provide for the use of refractory material in the mold to reduce or to avoid chilling the casting and to protect the metal parts of the mold from the casting heat; to construct and arrange the parts so that the refractory material may be easily replaced as may be required in case of wear or damageor for changing the size or shape of the casting; to provide novel and eflicicnt means for retaining the refractory material in the mold; and generally to improve, lighten and simplify the construction and operation of permanent molds whereby to facilitate the use thereof and reduce the cost of maintenance.

I have illustrated the invention in a selected embodiment in the accompanying drawings wherein I Fig. 1 is a side elevation of the mold,

Fig. 2 is a top plan view. I Fig. 3 is a sectional view on the line 33 of Fig. 2. y p p Fig. 4 is an elevation at the rear or pivot end of the mold.

Fig. 5 is a sectional View on the line55 of Fig. 1.

Fig. 6 is a sectional detail view showing the interconnection between the refractory and metal parts of the mold.

Referring to the drawings the drag of the mold comprises a pivot or rear end piece 6 and a pouring gate or front end piece 7,

59 said end pieces being recessed to receive a re- 1929. Serial No; 378,717.

fractory drag section 8, Fig. 8. The drag .end pieces are held together on the interposed. drag refractory section 8 by tie-rods 9 at the sides of the drag, these tie-rods carrying springs 10 for adjustment and for separating the end pieces to facilitate insertion and removal of the refractory section. This section is retained in place in its proper po sition in the drag end pieces by soft metal keys 11 which are formed by pouring soft metal into recesses 12 in the end pieces and recesses 13 in the refractory section which register with the recesses 12, Fig. 5. The mold shown in the drawing is made for casting brake shoes of the type which have chilled ends and for this purpose parts 14 of the drag end pieces form end portions of the mold cavity 15 and the refractory section 8 forms a corresponding intermediate portion of the mold cavity. The drag end piece 7 is of skeleton form and adapted to receive the refractory pouring gate 16 which is retained in place on the drag end piece and protected by the holder 17 removably secured to the end piece byrbolts 18, Fig. l. The pouring gate forms a part 16 of the end wall of the mold cavity. A refractory section 19 isheld in the drag end piece 6 by soft metal keys 20 like the keys 11 and forms part 19 of the end wall of the mold cavity. The cope comprises a skeleton meta-l shell 21 which is slidably engaged with and carried bodily by a carrier 22which is pivoted at 23 011 the drag end piece 6. The cope is provided with side ears 24 carrying bolts 25 which operate in slots 26 inthe carrier 22.

Springs 27 on the bolts bear against the can rier to hold the carrier snugly against the 1 cope. This construction permits the cope to 'be raised relatively to the other parts of the mold and to be swung withthe carrier to open position with the end piece resting upon a suitable support which may form a part of the mold or a part separate therefrom. Handles 28 are provided on the cope for lifting and swinging it. A refractory sec tion 29 is arranged in the cope to co-act with the refractory section 8 for forming the mold cavity 15. This refractory. section is held in the cope shell'by soft metal keys 30 J the cope by a looped wire 35. This wire en I 11. The refractory 29 has a central opening 31 to receive the attaching lug core 32 which is assembled as a unit insert with the attaching lug 33 and the reinforcing back 34 and is held in the top of the mold cavity against gages the unit insert and passes up through openings 36 in the refractory 29 and over a grooved cam 37 which is supported on a shaft 38 in bearings 39 on a cross piece 40 bolted to the cope shell. The cam is operated by a crank 38 on the shaft 38, anda ratchet 41 also mounted onthe shaft. 38 is engaged by a pawl 42 pivotally supported on the cross piece 40 for holding'the wire taut with the unit insert properly positioned snugly against the cope of the mold. A

refractory gate core 43 is held by the pouring gate holder 17 in proper relation with the pouring gate to close the pouring opening 16 except at the bottom thereof where it communicates with the mold cavity, Fig. 3.

This gate core is recessed at the bottom at 43"to assist in forming the discharge end of the pouring opening. A refractory section 44' is secured in the. cope carrier22 by soft metal keys 4501 opposite sides of the mold, these keys being substantially like the keys 11. Brake shoes areiprovided on the back and at their ends with end lugs and I provide: suitably formed refractory sections 46 in the cope to make these end lugs. The ends of the cope refractory section 29 are beveled at 47 and the'endlug. refractory sections 46 are shaped to engage these beveled surfaces 47. The section 46 adjacent the pouring gatealso engages the gate core and the section 46 adjacent the cope carrierv 22 engages the refractory section 44. These sections 46 rest upon: the drag end pieces 6 and 7 above those parts 14 which form end portions of the mold cavity, and they also engage the metalba-ck 34 of the unit insert;

The sections 46 are substantially triangular in shape, they are made separate from'the section 29 for convenience and so that they can be replaced as'required without necessitating replacement of the entire cope re: fract'ory. These sections 46 will break down paring the-mold for the casting operation-a The drag end pieces are provided with sock.- et lugs 48 on opposite sides to receive the centering pins 49 on the cope for registering the cope properly on the drag;

The invention provides a permanent mold of simple construction and consisting of" metal and refractory parts which are as-' sembled with suflici'ent accuracy and rigidity other castings.

for the molding operation and at the same time it has. a desirable flexibility which greatly facilitates the manufacture and assembly of the parts and operation of the mold. I have shown the mold adapted for making a railway brake shoe with chilled ends, as heretofore described, "and comprising refractory sections suitably disposed for this made of. other shapes and sizes and adapted .purpose,.but the refractory sections maybe for molding brake shoes of other kinds or The refractory material used in casting molds is subjected to'liability i of more or lessidamage and resultant waste because of the contraction of the casting in cooling, and my invention provides in a simple way for reducing this waste by pro-. viding the refractory sections 46 which will, if necessary, breakdown to permit contraction of the'brake shoe casting lengthwise.

, The softi'metal keys form a convenient and satisfactory means for holding the retrac tory sections in the mold,"they can be easily and-quickly applied and they adjust themselves in-the' process of forming them to effect conditions necessary to hold. particular refractory sections in the mold." The refractory sections safe-guard the keys from being affected by the heat of the casting operation'. g

I am aware that changes will have to be made'in parts of the invention to provide.

and also molds for other castings and I reserve the right tomake allsuch changesthat mol ds for making brake shoes of other kinds fall. within the: scope ofth'e following'cla'ims; 1

I claim I 1. A castingmold comprising a drag having two end'pieces spacedapart, an intermediate member, and means securing said end pieces together and holding the intermediate member in place therebetween.

2'. A casing. mold comprising a drag having twoend pieces spaced apart, an intermediate member, and yielding means securing said end pieces together and holding the intermediate member in place therebetween.

3; A casting-mold comprising a drag'having 'two end pieces spaced pa .3 i

and permit the casting to contract in: cooling; medmte'member and tle'rods at the sldesiof without damaging the section 29; Thebev-- said intermediate member andj connecti ng saidend pieces and hold-ingthe intermediate member in place therebetween.

the intermediate member in place .therebetween f ,1 comprisingeazdrag hay-- 5. A casting mold.

in'g twoend pieces spaced apart and oppositely recessed, anintermediate member having its ends: engaged with said recesses, and means securingsaid end'piece's together and holding the intermediate member in place 1 sitely recessed, an intermediate member having its ends engaged with said recesses, and tie-rods yieldingly mounted on said end pieces at the sides of said intermediate member and connecting said end pieces and holding the intermediate member in place therebetween. i a

7 A casting mold comprising a drag having two end pieces spaced apart and oppositely recessed, anintermediate member hav ing its ends projecting into said recesses, and keys interposed between overlapping parts of the end pieces and the intermediate member for securing the intermediate member in place in the end pieces.

8. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermedt ate member in place therebetween, and a pouring gate supported on one of said end pieces.

9. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place. therebetween, a pouring gate supported on one of said end pieces, and a holder secured to said end piece about the pouring gate.

10. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, and a cope pivotally connected at one end to one of said end pieces.

11. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetwcen, a carrier pivoted on one of said end pieces, and a cope mounted on said carrier.

12. A casting mold comprising a drag having' two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, a carrier piv oted on one of said end pieces, and a cope movable relative to and conjointly with said carrier.

13. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, a carrier pivoted on one of said end pieces,and a cope slidably mounted on said carrier to move relative thereto and conjointly therewith.

14. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together. and holding the intermediate member in place therebetween, carrier pivoted on one of said end piecesand having parallel verticalslots therein, a cope, andmeans on said cope and operating in said slots for connecting the cope to the carrier to move relative thereto and conjointly therewith.

15. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, acarrier pivoted on one of said end pieces and having parallel vertical slots thereima cope, and yielding means onsaid cope and operating in said slots for connecting the cope to the carrier to move relative thereto and conjointly therewith.

16. A casting mold comprising a drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, a carrier PiVr oted on one of said end pieces and having. parallel vertical slots therein, a cope, boltson the cope projecting laterally through said slots for connecting the cope to the carrier to move relatively thereto and conjointly therewith.

17 A castingmold comprisinga drag having two end pieces spaced apart, an intermediate member, means securing said end pieces together andholding the intermediate member inplace therebetween, a carrier pivoted on one of said end pieces and having parallel vertical slots therein, a cope, bolts on the cope projecting laterally through said slots for connecting the cope to the carrier to move relatively thereto and oonjointly therewith, and springs on the bolts bearing against said carrier to yieldingly hold the cope and carrier in abutting relation. i

18. A casting mold comprising a skeleton shell, a copehaving a section arranged in said shell and forming a wall portion of the mold cavity, andkeys engaging oppositewalls of said shell and section and holding the section in said shell.

.19. A casting mold comprising a skeleton shell, a cope having a section arranged in said 1 shell and forminga wall-portion of the mold cavity, and end blocks engageablewith said section and also forming wall portions of the moldcavity. i

20. A casting mold comprising a skeleton shell, a cope having a section arranged in said shell'fandztorming a wall portion of the mold cavity,,and frangible end blocks engageable with said section and also forming wall portions of the mold cavity.

21. A casting mold comprising a skeleton shell,'a cope having a section arranged in said shell and forming a wall portion of the mold cavity, said section having beveled ends, and

end blocksshaped to engage said beveled ends and alsoi'forming wall portions of the mol'd cope having a refractory section arranged in said shell and forming a wall portion'of the mold cavity, and separate refractory blocks forming wall portions of the mold cavity, said blocks being recessed to receive parts of the casting and adaptedto break down to accommodate contractionof the casting in cool ing without affecting other parts ofthe mold.

24. A casting mold comprising a drag hav: ing two end pieces-spaced apart, an intermediate member, means securing said end pieces together and holding the intermediate memher in place therebetween, a carrier pivoted on one of said end pieces, a pouring gate sup: ported on the other end piece, and a cope mounted on'said carrier to move independentl'yz'thereon between the carrierand the Pouring gate and to swing conjointly with the carrier. v

25. A casting mold comprising a 'drag-having two end pieces spaced apart, a refractory intermediate member, means securing said end pieces together and holding the intermediate member in place therebetween, said end pieces and intermediate member forming wall portions of the mold cavity, a re' fractor section on one end piece-and a-refractory pouring gate on the other end piece forming end wall portionsof the mold cavity, anda cope comprising a refractory section forming a wall portion, and end blocks sepa rate from but cooperating with said refrac- 'tory section and forming'wal-l-portions of the mold cavity. 26; A castingmold comprising a drag and a'cope having a mold cavity therein, means for holding an insert in said mold cavity to beembedded in the casting, said means comprising a looped Wire engaging the-insert insaid cooperatingreesses for connecting said refractory parts to said metal parts.

28.: A casting'mold comprising a drag and i a cope, said drag and cope having metal and refractory parts providing a mold cavity,

portions of said metal parts being disposed about said refractory parts whereby pore tions of the surfaces of saidparts will. be disposed in'opposition toeach other, the opposite surfaces of said: parts having cooperating recesses therein, and keys cast in said cooperating recesses for connecting said refractory parts to said metal parts. I I

Signedat New York,'iStat'e'of New York,

United States of America, this 3rd day of July,-A. D.,1929. JAMES S. THOMPSON.

and passing through the cope, a rotatable I shaft having an eccentric thereon about which said loop may be passed, and pawl 1 and rachet means cooperating with said shaft whereby when'said shaft-is rotated a to move said eccentric to tighten said loop' said shaft will'be movement. r

'27. A casting mold comprisinga drag and a cope, said drag and cope having metal and refractory parts providing a mold cavity,

portions, of said metal parts being disposed;

about said refractory parts whereby portions of the surfaces of said parts willbe disposed in oppositionto each other, the opposite surfaces of said parts having cooperati-ng recesses therein,-.and soft metal keys held against unloosen-ing 

